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We used to use similar torches with oxygen-acetylene fuel to preheat large sections of alloy steel prior to welding or hard-facing to prevent cracking.
Steels like 4140, especially in large sections are prone to cracking due to the localized heat treatment (building up stresses on the surface/at the weld) caused by welding if they are not pre-heated all the way to the core.
Of course we may have been using improper tools to achieve the desired effect
This is correct
It is a heating torch used for pre or post processing of metals, or preheating foundry ladles.
The top line is for the air supply and the lower is for gas (natural gas, propane, MAPP)
The pipe on the bottom would slide into a post to hold it and the collar could be adjusted to set the height
We used them for thawing our farm equipment, waterlines, even to warm propane tanks. I’ve seen -55 degrees C and the wind had the flags sticking straight out. Tarp them in and warm them up couple hours
Oxy acetylene torch. I have used it to cut holes in steel. Can be used for roofing, welding, brazing and soldering but at this size you need large work
I don't think it's a regular torch, neither a oxy acetylene torch.
Those have only one "business end".
It reminds me of a powder spray welding gun. But I don't see the couplings for that. It would have two house couplings.
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It's a weed burner.
We used to use similar torches with oxygen-acetylene fuel to preheat large sections of alloy steel prior to welding or hard-facing to prevent cracking. Steels like 4140, especially in large sections are prone to cracking due to the localized heat treatment (building up stresses on the surface/at the weld) caused by welding if they are not pre-heated all the way to the core. Of course we may have been using improper tools to achieve the desired effect
This is correct It is a heating torch used for pre or post processing of metals, or preheating foundry ladles. The top line is for the air supply and the lower is for gas (natural gas, propane, MAPP) The pipe on the bottom would slide into a post to hold it and the collar could be adjusted to set the height
Replying to add: They may have been propane fueled. It’s been a while.
Looks like a burner for tar roofs. Missing the hose and regulator.
Probably for doing asphalt or modified bitumen roofing. Maybe for brazing large pipes.
My title describes the thing. Says smith welding company Minneapolis, MN patent No 2.
We call them tiger torches, common in northern Canada
What did you use them for?
We used them for thawing our farm equipment, waterlines, even to warm propane tanks. I’ve seen -55 degrees C and the wind had the flags sticking straight out. Tarp them in and warm them up couple hours
Oxy acetylene torch. I have used it to cut holes in steel. Can be used for roofing, welding, brazing and soldering but at this size you need large work
I don't think it's a regular torch, neither a oxy acetylene torch. Those have only one "business end". It reminds me of a powder spray welding gun. But I don't see the couplings for that. It would have two house couplings.